No River Divides Mexico and North America—They Share a Land Border

There is no river that divides Mexico from North America. The premise is geographically incorrect.

Geographic Facts

• Mexico IS in North America. North America = Canada, USA, Mexico, Greenland, Bermuda, Saint Pierre & Miquelon.
• USA–Mexico Border: 3,145 km (1,954 mi). **~1,000 km follows the Rio Grande (Río Bravo)**—but the river is **within** North America, forming the *international boundary* between two North American nations.
• Other Border Segments: Land monuments (Sonora/Arizona, Baja California/California), Colorado River (short stretch).

Rivers *in* the Region

• Rio Grande / Río Bravo: Forms TX–Mexico border (El Paso–Brownsville).
• Colorado River: Forms AZ–Mexico border (24 km) before entering Mexico → Gulf of California.
• Tijuana River: Crosses border at San Ysidro/Tijuana.

These rivers **mark the border**; they do not separate Mexico from the continent it belongs to.